Stylefixes in access.py and removal of self.deny calls
The result of self.deny() is not very helpfull to the user, as such
we should not use it if we can provide a more sensible message.
Also made the document access checks use getForKeyFieldsOr404 to
prevent an error page when the specified document doesn't exist.
Patch by: Sverre Rabbelier
from django.dispatch import Signal
class_prepared = Signal(providing_args=["class"])
pre_init = Signal(providing_args=["instance", "args", "kwargs"])
post_init = Signal(providing_args=["instance"])
pre_save = Signal(providing_args=["instance", "raw"])
post_save = Signal(providing_args=["instance", "raw", "created"])
pre_delete = Signal(providing_args=["instance"])
post_delete = Signal(providing_args=["instance"])
post_syncdb = Signal(providing_args=["class", "app", "created_models", "verbosity", "interactive"])